For Australia use Wikicamps. iOverlander is good in Africa and South America.

Even in these timesof COVID, theres plenty of people back on the road and wildcamping, some never stopped, they just moved less during local lockdowns.

generally I don't use iOverlander listed wildcamps, too many of the ones I've visited are ruined by rubbish etc left behind by other users.

For me the best wildcamps are the ones you find yourself, and you keep the really good ones off the radar so they don't get ruined.